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Old 07-18-2017, 05:33 PM
73_RoadRunner's Avatar
73_RoadRunner 73_RoadRunner is offline
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Join Date: Mar 2002
Location: Monroe, Michigan
Age: 34
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Unhappy 98 grand Cherokee a/c hot air??

98 Jeep Grand Cherokee a/c hot air when on worked last year.
With a/c on and fan on high. The a/c pressure goes up to 50 psi then when a/c compressor clutch kicks in it goes down to 15psi then when clutch disengages it goes to 50psi

Any ideas what it could be? Dirty evaporator?
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Old 07-19-2017, 09:49 PM
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JVMopar JVMopar is online now
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Join Date: Feb 2000
Location: Mellen, WI
Age: 36
Posts: 2,506

Your system is low.

Pressures really depend on the ambient temperature and humidity. BUT low side pressure should be 30-35 psi and high side pressure 150-200 psi. Numbers are really just an estimate, but should be in that ball park.

As long as there is still refrigerant in the system, you are ok to add. I would get cans of refrigerant that have dye and oil in them. That way you can find the leak. Legally your not supposed to charge a system that has a leak. And if it's low, there is a leak.

Start by adding a can and see where your pressures are. If you can get it into the 30-35 range. Call it good enough.

Low side port is the smaller diameter port. And the High side port is the larger diameter.
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Old 07-20-2017, 08:37 AM
dakman1 dakman1 is offline
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What JVMopar said.
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